Book/Dissertation / PhD Thesis

FZJ-2021-03611

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Infiltrated Positive Electrodes for All-Solid-State Sodium Batteries

Lan, T. (Corresponding author)FZJ*

2021
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-576-5

Please use a persistent id in citations: http://hdl.handle.net/2128/28815

Abstract: All-solid-state batteries (ASSBs) are regarded as promising candidates for nextgeneration energy storage systems due to several superior properties in comparison to state-of-the-art batteries using liquid electrolytes. ASSBs have advantages with respect to no-leaking electrolytes, wider temperature window, and potentially higher volumetric energy density than those batteries using liquid electrolyte. In addition, ceramic ion-conducting oxides, as electrolyte materials, offer further benefit from their high conductivity, as well as good mechanical, chemical, and thermodynamic stability. Though great achievements have been made in the development of all-solid-state batteries, there are still a number of problems to be solved, especially with respect to the positive electrodes. The rigid nature of solid-state electrolyte materials restricts the electrolyte-electrode contact and causes problems during the fabrication of components. In the positive electrodes, contacts between randomly-arranged grains of Na-ion conductors and electrode active materials are not efficient for both ion conduction and electrochemical reaction. These rigid contacts are further damaged by volume changes of electrode active materials during electrochemical cycling. These electrode problems above are reported to be more severe in Na-based ASSBs (Na-ASSBs) due to the larger ionic radius of Na$^{+}$ and thus larger volume changes of the electrode materials. In order to solve the problems associated with the positive electrodes of Na-ASSBs, a new electrode design is needed together with a practical preparation method. In this thesis, Na-ASSBs have been built using NaSICON-type Na$_{3.4}$Zr$_{2}$Si$_{2.4}$P$_{0.6}$O$_{12}$ as the electrolyte material. A material with similar structure as the electrolyte, Na$_{3}$V$_{2}$P$_{3}$O$_{12}$, was chosen as the positive electrode material. Na$_{3}$V$_{2}$P$_{3}$O$_{12}$ has been widely studied as the electrode material for batteries with liquid electrolyte, but only a few unsuccessful attempts have been made to apply the material in ASSBs.

Note: Dissertation, RWTH Aachen, 2020

---

Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)

Appears in the scientific report 2021

---

Database coverage:
;

---